Commit 48f7ea1

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Add one more test for BST.

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Original file line number	Diff line number	Diff line change
`@@ -76,4 +76,23 @@ describe('BinarySearchTree', () => {`
`76`	`76`
`77`	`77`	`expect(bst.toString()).toBe('obj1,obj2,obj3');`
`78`	`78`	`});`
	`79`	`+`
	`80`	`+ it('should be traversed to sorted array', () => {`
	`81`	`+ const bst = new BinarySearchTree();`
	`82`	`+`
	`83`	`+ bst.insert(10);`
	`84`	`+ bst.insert(-10);`
	`85`	`+ bst.insert(20);`
	`86`	`+ bst.insert(-20);`
	`87`	`+ bst.insert(25);`
	`88`	`+ bst.insert(6);`
	`89`	`+`
	`90`	`+ expect(bst.toString()).toBe('-20,-10,6,10,20,25');`
	`91`	`+ expect(bst.root.height).toBe(2);`
	`92`	`+`
	`93`	`+ bst.insert(4);`
	`94`	`+`
	`95`	`+ expect(bst.toString()).toBe('-20,-10,4,6,10,20,25');`
	`96`	`+ expect(bst.root.height).toBe(3);`
	`97`	`+ });`
`79`	`98`	`});`

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